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1 definition found
 for Ultramarine ashes
From The Collaborative International Dictionary of English v.0.48 :

  Ultramarine \Ul`tra*ma*rine"\, n. [Cf. Sp. ultramarino. So
     called because the lapis lazuli was originally brought from
     beyond the sea, -- from Asia.] (Chem.)
     A blue pigment formerly obtained by powdering lapis lazuli,
     but now produced in large quantities by fusing together
     silica, alumina, soda, and sulphur, thus forming a glass,
     colored blue by the sodium polysulphides made in the fusion.
     Also used adjectively.
     [1913 Webster]
  
     Green ultramarine, a green pigment obtained as a first
        product in the manufacture of ultramarine, into which it
        is changed by subsequent treatment.
  
     Ultramarine ash or Ultramarine ashes (Paint.), a pigment
        which is the residuum of lapis lazuli after the
        ultramarine has been extracted. It was used by the old
        masters as a middle or neutral tint for flesh, skies, and
        draperies, being of a purer and tenderer gray than that
        produced by the mixture of more positive colors.
        --Fairholt.
        [1913 Webster]

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